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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The maximum steam pressure in a Locomotive boiler is limited to

180 MN/m²
18 MN/m²
0.18 MN/m²
1.8 MN/m²

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Steam Boilers, Engines, Nozzles and Turbines
Secondary air is the air used to

Convert CO (formed in lower zone of furnace) into CO₂ at higher zone
Air delivered by induced draft fan
Provide air around burners for obtaining optimum combustion
Transport and dry the coal

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Steam Boilers, Engines, Nozzles and Turbines
With increase in load, convection superheater has

Flat characteristic
Linear characteristic
Rising characteristic
Drooping characteristic

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following is required for a steam condensing plant?

Condenser
Air extraction pump
Condensate pump
All of these

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

Vb = V² cosα
Vb = 0.5 V² cosα
Vb = V cosα
Vb = 0.5 V cosα

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Steam Boilers, Engines, Nozzles and Turbines
The effect of super-saturation is that the

Entropy and specific volume of the steam increases
Mass of the steam discharged increases
All of these
Exit velocity of steam reduces

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